ST25DV64K datasheet(123/197 Pages) STMICROELECTRONICS

123 / 197 page

7.6.36

Present Password

On receiving the Present Password command, the ST25DVxxx compares the requested password with the

data contained in the request and reports if the operation has been successful in the response. Refer to

Section 5.6 Data Protection for details on password Management. After a successful command, the security

session associate to the password is open as described in Section 5.6 Data Protection.

The Option_flag is not supported, and the Inventory_flag must be set to 0.

Table 210. Present Password request format

Request

SOF

Request_flags

Present

Password

IC Mfg

code

UID (1)

Password

number

Password CRC16

Request

EOF

8 bits

B3h

02h

64 bits 8 bits

64 bits

16 bits

1. This field is optional.

Request parameter:

•

Request flags

•

UID (optional)

•

Password Number:

–

00h = RF configuration password RF_PWD_0

–

01h = RF_PWD_1

–

02h = RF_PWD_2

–

03h = RF_PWD_3

–

other = Error

•

Password

Table 211. Present Password response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Response parameter:

•

No parameter. The response is sent back after the write cycle.

Table 212. Present Password response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Response parameter:

•

Error code as Error_flag is set:

–

02h: command not recognized

–

03h: command option not supported

–

0Fh: the present password is incorrect

–

10h: the password number is incorrect

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 11

page 123/197

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